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. 1998 Nov 1;112(5):569–576. doi: 10.1085/jgp.112.5.569

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Average dynamic response of S. purpuratus and L. pictus to an 11-min ramp. (A) The time dependence between 2 and 8 min is shown. The time to 50% response is significantly different between the two species. (B) The same response with the time axis normalized to represent the calcium concentration in the chamber is shown.